As you know, the oceans are a complex system that covers most of the earth, and contains a huge amount of resources. protecting these resources is one reason to try and prevent the pollution of the oceans. algae is one ocean resource in particular that is vulnerable to pollution. the algae are a valuable resource because they absorb carbon dioxide from the atmosphere and release into the atmosphere. a) oxygen b) nitrogen c) water vapor d) carbon monoxide

You have two photos of a person walking. one shows the person at the corner of third and main streets, the other shows the person at the corner of tenth and main streets. there are lampposts at every corner in this town, and the first picture shows it to be 10: 32: 00 exactly. the second picture shows it to be 10: 49: 30. you know three facts: (1) all of the clocks are synchronized; (2) there are exactly 12 equal-sized blocks per kilometer in this town; and (3) the streets that cross main in this area are numbered consecutively, with no interruptions. what is the person’s average speed in kilometers per hour?